scholarly journals Majorana Neutrino Oscillations in Vacuum

2012 ◽  
Vol 03 (08) ◽  
pp. 803-814 ◽  
Author(s):  
Yuber Ferney Perez ◽  
Carlos Jose Quimbay
Keyword(s):  
Neutrino Oscillations ◽  
Majorana Neutrino

scholarly journals ν-K0 ANALOGY, DIRAC–MAJORANA NEUTRINO DUALITY AND THE NEUTRINO OSCILLATIONS

2001 ◽  
Vol 16 (30) ◽  
pp. 4911-4923
Author(s):  
E. M. LIPMANOV
Keyword(s):  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Majorana Neutrino ◽  
Zero Approximation ◽  
Short Baseline ◽  
Charge Symmetry ◽  
Dirac Neutrino ◽  
Doublet Structure ◽  
Lepton Charge

The intent of this paper is to convey a new primary physical idea of a Dirac–Majorana neutrino duality in relation to the topical problem of neutrino oscillations. In view of the new atmospheric, solar and the LSND neutrino oscillation data, the Pontecorvo ν - K0 oscillation analogy is generalized to the notion of neutrino duality with substantially different physical meaning ascribed to the long-baseline and the short-baseline neutrino oscillations. At the level of CP-invariance, the suggestion of dual neutrino properties defines the symmetric two-mixing-angle form of the widely discussed four-neutrino (2 +2)-mixing scheme, as a result of the lepton charge conservation selection rule and a minimum of two Dirac neutrino fields. With neutrino duality, the two-doublet structure of the Majorana neutrino mass spectrum is a vestige of the two-Dirac-neutrino origin. The fine neutrino mass doublet structure is natural because it is produced by a lepton charge symmetry violating perturbation on a zero-approximation system of two twofold mass-degenerate Dirac neutrino–antineutrino pairs. A set of inferences related to the neutrino oscillation phenomenology in vacuum is considered.

scholarly journals TeV-scale resonant leptogenesis with new scaling ansatz on neutrino Dirac mass matrix from A4 flavor symmetry

2020 ◽  
Vol 35 (17) ◽  
pp. 2050077
Author(s):  
H. B. Benaoum ◽  
S. H. Shaglel
Keyword(s):  
Parameter Space ◽  
Neutrino Oscillations ◽  
Mass Matrix ◽  
Baryon Number ◽  
Majorana Neutrino ◽  
Low Energy ◽  
Flavor Symmetry ◽  
Dirac Mass ◽  
Energy Neutrino ◽  
Baryon Number Asymmetry

We propose a new scaling ansatz in the neutrino Dirac mass matrix to explain the low energy neutrino oscillations data, baryon number asymmetry and neutrinoless double beta decay. In this work, a full reconstruction of the neutrino Dirac mass matrix has been realized from the low energy neutrino oscillations data based on type-I seesaw mechanism. A concrete model based on [Formula: see text] flavor symmetry has been considered to generate such a neutrino Dirac mass matrix and imposes a relation between the two scaling factors. In this model, the right-handed Heavy Majorana neutrino masses are quasi-degenerate at TeV mass scales. Extensive numerical analysis studies have been carried out to constrain the parameter space of the model from the low energy neutrino oscillations data. It has been found that the parameter space of the Dirac mass matrix elements lies near or below the MeV region and the scaling factor [Formula: see text] has to be less than 10. Furthermore, we have examined the possibility for simultaneous explanation of both neutrino oscillations data and the observed baryon number asymmetry in the Universe. Such an analysis gives further restrictions on the parameter space of the model, thereby explaining the correct neutrino data as well as the baryon number asymmetry via a resonant leptogenesis scenario. Finally, we show that the allowed space for the effective Majorana neutrino mass [Formula: see text] is also constrained in order to account for the observed baryon asymmetry.

scholarly journals PATTERN OF THE APPROXIMATE MASS DEGENERACY OF MAJORANA NEUTRINOS

2002 ◽  
Vol 17 (05) ◽  
pp. 289-294 ◽  
Author(s):  
ERNEST MA
Keyword(s):  
Symmetry Breaking ◽  
Solar Neutrino ◽  
Neutrino Oscillations ◽  
Majorana Neutrino ◽  
Electron Neutrino ◽  
Neutrino Masses ◽  
Interesting Possibility ◽  
Majorana Neutrinos ◽  
Mass Degeneracy ◽  
Natural Pattern

In view of the recently reported evidence for a nonzero Majorana mass of the electron neutrino, together with the established phenomena of atmospheric and solar neutrino oscillations, the case of three nearly mass-degenerate Majorana neutrinos is now an interesting possibility. We show in this paper how a natural pattern of symmetry breaking in the recently proposed A4 model of Majorana neutrino masses can accommodate the data on neutrino oscillations, resulting in the predictions sin 2 2θ atm = 1 and sin 2 2θ sol = 2/3.

scholarly journals Lepton textures and neutrino oscillations

2014 ◽  
Vol 29 (21) ◽  
pp. 1444009 ◽  
Author(s):  
Rohit Verma
Keyword(s):  
Effective Mass ◽  
Beta Decay ◽  
Neutrino Oscillation ◽  
Neutrino Oscillations ◽  
Neutrinoless Double Beta Decay ◽  
Majorana Neutrino ◽  
Double Beta Decay ◽  
Systematic Analysis ◽  
Mass Matrices ◽  
Unitary Transformations

A systematic analysis of the textures arising in lepton mass matrices have been carried out using unitary transformations and condition of naturalness for the Dirac and Majorana neutrino possibilities. It is observed that the recent three neutrino oscillation data together with the effective mass in neutrinoless double beta decay provide vital clues in predicting the general structures of these lepton mass matrices.

Neutrino oscillations in a medium with variable density

1986 ◽  
Vol 150 (12) ◽  
pp. 632
Author(s):  
S.P. Mikheev ◽  
A.Yu. Smirnov
Keyword(s):  
Neutrino Oscillations ◽  
Variable Density
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